Question

❤️❤️❤️❤️ What is achromatism? Give a condition???

Answer 1

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հίί ʍαtε_______✯◡✯
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һєяє' ʏȏȗя ѧṅśwєя ʟȏȏҡıṅɢ ғȏя________
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✯ACHROMATISM:--
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●achromatism is the phenomenon by virtue of which an object seen in white light through a lens would appear white i.e.there is no colour splitting
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●CONDITION:-
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To achieve achromatism ,all colours should be focused at a single point .To produce an achromat lens , a convex lens with positive chromatic aberration should be combined with a suitable concave lens of negative chromatic aberration so that total chromatic aberration is zero.

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$hope \: it \: helps$

★BRAINLY★

Answer 2

Condition for achromatism is that " The ratio of the dipersive power must be equal to the ratio of the focal length of the two lenses." i.e,

w1/w2 = f1/f2 where, w1 and w2 are the dispersive power of the two lenses and f1 and f2 are the focal lengths.